Schema validation not trimming strings before validating
<xs:schema ...>
  ...
  <xs:simpleType name="ItemTypeData">
    <xs:restriction base="xs:string">
      <xs:enumeration value="ItemA" />
    </xs:restriction>
  </xs:simpleType>
</xs:schema>

...
<ItemType>ItemA</ItemType>
...

...
<ItemType>
  ItemA
</ItemType>
...